Faruq,
White People are called White Ghosts, Bak Gwai/Bai Guei. This is a derogatory term which most would associate with the word cracker, whitey....
Hak Guei, Hei Gwai means Black Ghost, and everyone knows that word which is the African American equivalent.
It has racial overtones, but is a great formula for bruising that you can feel but not see. I have no idea how the original company came up with the name.
There have been many products over the years in China that used African Americans to sell.
Be careful as it has turpentine oil in it and can be harsh on the skin.
Mouth Boxers have not the testicular nor the spinal fortitude to be known.
Hence they hide rather than be known as adults.